login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199532 Number of -n..n arrays x(0..4) of 5 elements with zero sum and no two consecutive zero elements 1
32, 320, 1324, 3734, 8470, 16682, 29750, 49284, 77124, 115340, 166232, 232330, 316394, 421414, 550610, 707432, 895560, 1118904, 1381604, 1688030, 2042782, 2450690, 2916814, 3446444, 4045100, 4718532, 5472720, 6313874, 7248434, 8283070 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A199530

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = (115/12)*n^4 + (115/6)*n^3 + (41/12)*n^2 - (1/6)*n

EXAMPLE

Some solutions for n=5

..2....1....3...-5....1....0....5....5...-3....4...-5....1...-5...-2....0...-1

.-5...-2....4....4....4...-1...-3....0...-1...-3....1....0....3....3....1....5

.-4...-2...-4....1....3....1...-3...-2....2...-5....2...-5...-2...-3...-3....3

..3....4...-1...-2...-5....3...-1...-1...-3...-1....2....4...-1...-2...-3...-3

..4...-1...-2....2...-3...-3....2...-2....5....5....0....0....5....4....5...-4

CROSSREFS

Sequence in context: A061958 A050279 A096764 * A165004 A244867 A173952

Adjacent sequences:  A199529 A199530 A199531 * A199533 A199534 A199535

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 07 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 21 09:07 EST 2014. Contains 252300 sequences.